Re: [HTCondor-users] changing cgroup parameters for good?

["Bockelman, Brian" <BBockelman@xxxxxxxxxxxxx>]

Hi Thomas,

Nothing comes to mind.  I wonder if you could modify the unit and "reload" systemd without interrupting HTCondor?  I suspect that might be what happened with the package updates.

Brian

> On Jun 12, 2019, at 3:11 AM, Thomas Hartmann <thomas.hartmann@xxxxxxx> wrote:
> 
> Hi all,
> 
> I stumbled over a cgroup/systemd(?) related question, when I was trying
> to fix a cgroup value for the condor parent group and systemd
> (presumably) took notice after some time.
> 
> I limited the walltime for all condor cgroupds to 1/4 of the overall
> (logical cpu) wall time [1] (stopgap as the cpu govenor vs. board had
> issues).
> Which worked fine until an auto-update updated some packages and
> triggered systemd, which reset the parameter to its original value (-1).
> 
> So, I wonder if somebody knows a way to fix on the fly parameters in the
> condor cgroup(s) actuallybelonging to systemd (beyond modifying the unit
> as I would like to avoid loosing running jobs etc. [2])?
> 
> 
> Cheers,
>  Thomas
> 
> 
> [1]
>> TIMEWINDOW=1000000
>> echo ${TIMEWINDOW} >
> /sys/fs/cgroup/cpu,cpuacct/system.slice/condor.service/cpu.cfs_period_us
>> echo $(cat /proc/cpuinfo  | grep processor | wc -l)*${TIMEWINDOW}/4 |
> bc > /sys/fs/cgroup/cpu,cpuacct/system.slice/condor.service/cpu.cfs_quota_us
> 
> [2]
> https://www.freedesktop.org/software/systemd/man/systemd.resource-control.html
> 
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